<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      class A {
        constructor(name, age) {
          this.name = name;
          this.age = age;
        }
        call() {}
      }
      class B extends A {
        constructor(name, age) {
          super(name, age);
        }
      }
      let b = new B("zs", 15);
      console.log(b);
    </script>
  </body>
</html>
